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The effect of triamterene on urinary excretion of prostaglandin E was studied, and the results were compared with those obtained with spironolactone. Urinary excretion of immunoreactive prostaglandin E was measured radioimmunologically. Triamterene was administered in a dose of 100 mg/day for 8 days to 7 patients with essential hypertension. Following the administration of triamterene, urinary prostaglandin E tended to increase. However, the increment was not significant. The lack of significant increase in urinary prostaglandin E excretion during the administration of triamterene contrasted with our previous finding with spironolactone, in which a significant increase in prostaglandin E excretion was observed on the first day of spironolactone administration. Urinary Na excretion and urinary Na/K ratio were significantly increased and urine volume also tended to increase following the administration of triamterene. Plasma renin activity and plasma aldosterone concentration were increased in all cases. However, there was no significant correlation between these parameters and urinary prostaglandin E. These results suggest that the effect of triamterene on renal prostaglandin E synthesis is different from that of spironolactone and that the change in urinary prostaglandin E after the administration of triamterene is not the reflection of the change in the renin-angiotensin-aldosterone system.
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